Si instalaste XAMPP o algun otro paquete similar hay una opcion que tienes que activar para habilitar el acceso remoto.
En XAMPP es:
http://localhost/security/index.php Cita: These XAMPP pages are accessible by network for everyone UNSECURE
Every XAMPP demo page you are right now looking at is accessible for everyone over network. Everyone who knows your IP address can see these pages.